CN1690590B - Two-stage screw bolt refrigerating machine - Google Patents

Two-stage screw bolt refrigerating machine Download PDF

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Publication number
CN1690590B
CN1690590B CN200510067063XA CN200510067063A CN1690590B CN 1690590 B CN1690590 B CN 1690590B CN 200510067063X A CN200510067063X A CN 200510067063XA CN 200510067063 A CN200510067063 A CN 200510067063A CN 1690590 B CN1690590 B CN 1690590B
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China
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mentioned
oil
stage
grade
stream
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Expired - Fee Related
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CN200510067063XA
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Chinese (zh)
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CN1690590A (en
Inventor
壶井升
神吉英次
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Kobe Steel Ltd
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Kobe Steel Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/028—Means for improving or restricting lubricant flow
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0852—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load directly responsive to abnormal temperature by using a temperature sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/26—Refrigerants with particular properties, e.g. HFC-134a
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/40—Electric motor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The invention provides a two-stage screw refrigerating device where simplification of the structure, miniaturization, and reduction of the maintenance load can be realized. In addition to a two-stage oil cooling screw compressor having a pair of male/female first/second stage screw rotors in mutual mesh, the two-stage screw refrigerating device is equipped with a refrigerant circulation flow passage comprising an oil separating collector, a condenser, an expansion valve and an evaporator and an oil flow passage for guiding oil in the oil separating collector to an oil supplying place including at least a bearing and shaft seal parts in the two-stage oil cooling screw compressor. The two-stage screw refrigerating device is provided with a branch flow passage III diverging from a point of the refrigerant circulation flow passage I between the condenser and the expansion valve and communicating with any of the first stage screw rotor, the second stage screw rotor, and a middle stage between the rotors via a throttle means.

Description

Two-stage screw bolt refrigerating machine
Technical field
The present invention relates to use the two-stage screw bolt refrigerating machine of twin-stage oil injection type helical-lobe compressor.
Background technology
In the past, using the two-stage screw bolt refrigerating machine of twin-stage oil injection type helical-lobe compressor is well-knownly (for example to open flat 1-273894 communique with reference to the spy and the spy opens the 2003-130477 communique.)。
Open the two-stage screw bolt refrigerating machine that flat 1-273894 communique is put down in writing according to the spy, the oil of discharging from twin-stage oil injection type helical-lobe compressor with compression refrigerant gas is separated recover (oil eliminator) after this refrigerant gas separation, recovery by oil, by water-cooled oil cooler cooling, and the process oil filter supplies to bearing etc.
Open the two-stage screw bolt refrigerating machine that the 2003-130477 communique is put down in writing according to the spy, in order to supply with the cooling medium in the oil cooler, be provided with from liquid refrigerant branch's stream of cold-producing medium circulation stream branch, after compression refrigerant gas is separated from this refrigerant gas by oil eliminator from the oil of twin-stage oil injection type helical-lobe compressor discharge, in above-mentioned oil cooler,, supply to each bearing of twin-stage oil injection type helical-lobe compressor by of the liquid refrigerant cooling of aforesaid liquid cold-producing medium with branch's stream.
Under the situation of above-mentioned two-stage screw bolt refrigerating machine in the past, it is the cooling water or the difference of liquid refrigerant that cooling medium exists, but is provided with oil cooler, thereby exists complex structure, volume big, and the problem that also increases of upkeep operation.
Summary of the invention
The present invention makes in order to eliminate these problems in the past, and its purpose is to provide simple structureization, miniaturization, can alleviates the two-stage screw bolt refrigerating machine of maintenance load etc.
In order to solve above-mentioned problem, the 1st scheme is a kind of two-stage screw bolt refrigerating machine, it is characterized in that, comprise: twin-stage oil injection type helical-lobe compressor, above-mentioned twin-stage oil injection type helical-lobe compressor has the 1st grade of screw rotor and the 2nd grade of screw rotor, and described the 1st grade of screw rotor and the 2nd grade of screw rotor all have a pair of rotor of intermeshing negative and positive;
Cold-producing medium circulation stream, above-mentioned cold-producing medium circulation stream comprise that oil separates recover, condenser, expansion valve and evaporimeter;
The oil stream, above-mentioned oily stream with above-mentioned oil separate oil in the recover lead in the above-mentioned twin-stage oil injection type helical-lobe compressor, comprise oil supply place of bearing, axle envelope portion at least;
And branch's stream, above-mentioned branch stream from the above-mentioned cold-producing medium circulation stream above-mentioned condenser and the part branch between the above-mentioned expansion valve come out, and through throttling arrangement and with above-mentioned the 1st grade of screw rotor, above-mentioned the 2nd grade of screw rotor and above-mentioned the 1st grade of screw rotor and above-mentioned the 2nd grade of screw rotor between middle end difference in certain be communicated with.
The 2nd scheme is in the structure of the 1st scheme, and oil accumulated portion in the middle of the middle end difference between above-mentioned the 1st grade of screw rotor and above-mentioned the 2nd grade of screw rotor had, and the position that above-mentioned branch stream is communicated with is that above-mentioned middle oil accumulates portion.
The 3rd scheme is in the structure of the 1st scheme, and the position that above-mentioned branch stream is communicated with is by above-mentioned the 1st grade of gas compression stroke that screw rotor forms.
The 4th scheme is in the structure of the 1st scheme, and the position that above-mentioned branch stream is communicated with is by above-mentioned the 2nd grade of gas compression stroke that screw rotor forms.
The 5th scheme, be on the 1st to the 4th scheme basis, also have with the lower part: Temperature Detector, said temperature detector detect in the above-mentioned cold-producing medium circulation stream, be positioned at the discharge side of above-mentioned twin-stage oil injection type helical-lobe compressor and be positioned at the stream temperature of part of the upstream side of above-mentioned condenser; And temperature control equipment, the said temperature control device is regulated the aperture of above-mentioned throttling arrangement and is made that temperature reaches design temperature in the above-mentioned stream.
Two-stage screw bolt refrigerating machine according to the 1st scheme, the above-mentioned condenser of utilization from above-mentioned cold-producing medium circulation stream come out with the part branch between the above-mentioned expansion valve and through throttling arrangement and with above-mentioned the 1st grade of screw rotor, above-mentioned the 2nd grade of screw rotor and above-mentioned the 1st grade of screw rotor and above-mentioned the 2nd grade of screw rotor between middle end difference branch's stream of being communicated with of certain, refrigerant gas is cooled in the part that this branch's stream is communicated with.Therefore, can save oil cooler, have the effect that can make simple structureization, miniaturization, alleviate maintenance load etc. for the cooling usefulness of the needed oil of cooling of refrigerant gas.
Two-stage screw bolt refrigerating machine according to the 2nd scheme, oil is cooled in the middle oil portion of accumulating of the middle end difference between above-mentioned the 1st grade of screw rotor and above-mentioned the 2nd grade of screw rotor, and refrigerant gas also is cooled, so, still can save oil cooler, have the effect that can make simple structureization, miniaturization, alleviate maintenance load etc.
According to the two-stage screw bolt refrigerating machine of the 3rd or the 4th scheme, except that the effect of the 1st scheme, also has the effect that can alleviate the power that is used for the refrigerant gas compression.
Two-stage screw bolt refrigerating machine according to the 5th scheme, except that the effect of the 1st to the 4th scheme, have also that can to make the temperature of the oil of supplying with from the oil supply of oily stream in twin-stage oil injection type helical-lobe compressor be proper temperature, thereby make temperature in the stream of discharge side of twin-stage oil injection type helical-lobe compressor reach the effect of design temperature.
Description of drawings
Fig. 1 is the integrally-built figure of the two-stage screw bolt refrigerant device of expression the 1st, the 2nd scheme.
Fig. 2 is the integrally-built figure of the two-stage screw bolt refrigerant device of expression the 1st, the 3rd scheme.
Fig. 3 is the integrally-built figure of the two-stage screw bolt refrigerant device of expression the 1st, the 4th scheme.
Fig. 4 is the integrally-built figure of two-stage screw bolt refrigerant device of the 1st embodiment of expression the 1st, the 5th scheme.
Fig. 5 is the integrally-built figure of two-stage screw bolt refrigerant device of the 2nd embodiment of expression the 1st, the 5th scheme.
The specific embodiment
Below, according to figure explanation embodiments of the present invention.
Figure 1 shows that the two-stage screw bolt refrigerant device 1A of the 1st scheme, the 2nd scheme, this two-stage screw bolt refrigerant device 1A has: comprise that twin-stage oil injection type helical-lobe compressor 11, oil separate the cold-producing medium circulation stream I of recover 12, condenser 13, expansion valve 14 and evaporimeter 15; With oil separate in the recover 12 oil---the oil that is its underpart accumulates the oily stream II that described later oily supply place of oil to twin-stage oil injection type helical-lobe compressor 11 in the portion 16 guided; Condenser 13 from the cold-producing medium circulation stream I and the part branch between the expansion valve 14 comes out and the middle stream III of branch that is provided with throttling arrangement 17.
Twin-stage oil injection type helical-lobe compressor 11, in being formed with the compression case 23 that suction inlet 21, opposite side be formed with outlet 22, a side has the 1st grade of screw rotor 24 and the 2nd grade of screw rotor 25, described the 1st grade of screw rotor 24 and the 2nd grade of screw rotor all have a pair of rotor of intermeshing negative and positive, between the 1st grade of screw rotor 24 and the 2nd grade of screw rotor 25, promptly the middle end difference 28 between the suction portion 27 of the discharge portion 26 of the 1st grade of screw rotor 24 and the 2nd grade of screw rotor 25 is formed with the middle oil that accumulates oil and accumulates portion 29.Again, these the 1st grade of screw rotor 24 and the 2nd grade of screw rotor 25 are rotatably supported in clutch shaft bearing axle envelope portion 31, the second bearing shaft envelope portion 32, the 3rd bearing shaft envelope portion 33, and a rotor of the 1st grade of screw rotor 24 and a shared armature spindle of rotor of the 2nd grade of screw rotor 25 can coaxially rotate.And, all form semiclosed structure as the motor shell 42 of the motor 41 of the drive division of twin-stage oil injection type helical-lobe compressor 11 and the compression case 23 of one combination with it, in motor shell 42, take in the rotor 43 of the above-mentioned rotor common axis of the 1st grade of screw rotor 24 and surround its stator 44.Therefore, the axle of this rotor also becomes the output shaft of motor 41, rotates the 1st grade of screw rotor 24 of driving and the 2nd grade of screw rotor 25 via an above-mentioned rotor of this rotor and the 2nd grade of screw rotor 25 by motor 41.
On the other hand, in the present embodiment, except that clutch shaft bearing axle envelope portion 31, the second bearing shaft envelope portion 32, the 3rd bearing shaft envelope portion 33, oily stream II also accumulates gas compression stroke that portion 16 guiding forms by the 1st grade of screw rotor 24 and the 2nd grade of screw rotor 25 everywhere with oil from oil.Wherein, the gas compression stroke is the space that is in the gas compression processes, so become the state that is not communicated with suction inlet 21, discharge portion 26, suction portion 27, outlet 22.Again, oil accumulated portion 29 in the middle of branch's stream III was communicated with through throttling arrangement 17.In addition,, get final product, for example comprise orifice plate, fixed restrictive valve, variable throttle valve so long as have the device of throttling action as this throttling arrangement 17.
And, in having the two-stage screw bolt refrigerant device 1A of said structure, the refrigerant gas that sucks from the suction inlet 21 of twin-stage oil injection type helical-lobe compressor 11 is compressed owing to inject from the oil of oily stream II, from discharge portion 26 along with oil to middle end difference 28 discharges.And, follow this oily refrigerant gas to be inhaled into the 2nd grade of screw rotor 25 from suction portion 27, owing to injecting, the oil from oily stream II is compressed, and separate recover 12 from outlet 22 to oil with oil and discharge.The oil of supplying with clutch shaft bearing axle envelope portion 31, the second bearing shaft envelope portion 32, the 3rd bearing shaft envelope portion 33 also returns oil and separates recover 12, separate in the recover 12 at this oil, refrigerant gas separates with oil, oil temporarily accumulates in oil and accumulates in the portion 16, is sent the part of the cold-producing medium circulation stream I that begins to extend from the top of oil separation recover 12 except that the refrigerant gas after deoiling.
Oil accumulates the oil of portion 16 and supplies with to clutch shaft bearing axle envelope portion 31, the second bearing shaft envelope portion 32, the 3rd bearing shaft envelope portion 33 by oily stream II, and the gas compression stroke that guiding is formed by the 1st grade of screw rotor 24 and the 2nd grade of screw rotor 25 everywhere, afterwards, be recovered to oil and separate recover 12, for recycling repeatedly.
Relative with it, separate the refrigerant gas that recover 12 comes out from oil, at condenser 13 by low-temperature heat source---for example water is inhaled the amount of reducing phlegm and internal heat and condensation, become refrigerant liquid arrives the stream III of branch from condenser 13 branch point, part at this refrigerant liquid is diverted to the stream III of branch, and remainder then flows to expansion valve 14.The refrigerant liquid that has flowed to expansion valve 14 becomes gaseous state and temperature decline through expansion valve 14 rear sections, afterwards, from the high temperature heat source draw heat and fully evaporation in evaporimeter 15 becomes gaseous state and returns the suction inlet 21 of two-stage screw bolt refrigerant device 1A.Again, be diverted to the refrigerant liquid of the stream III of branch, partly becoming gaseous state and temperature through throttling arrangement 17 descends, oil accumulates portion 29 in the middle of flowing into, thereby when making the oily temperature drop here low, become gaseous state fully, and middle end difference 28 be accompanied by the refrigerant gas interflow that flows to the oil of suction portion 27 from discharge portion 26.Its result, the oil that middle oil accumulates portion 29 is cooled, and simultaneously at middle end difference, oil and refrigerant gas also are cooled.
Like this, according to this two-stage screw bolt refrigerant device 1A, be used to when the middle oil of the refrigerant cools of the stream III of branch accumulates the oil of portion 29, oil and refrigerant gas are cooled at middle end difference, so, there is no need as now, on oily stream II, oil cooler to be set, simple structureization, miniaturization, maintenance load are also alleviated.
Figure 2 shows that the two-stage screw bolt refrigerant device 1B of the 1st, the 3rd scheme, in this two-stage screw bolt refrigerant device 1B, for adopting same mark and omit explanation with the general part of above-mentioned two-stage screw bolt refrigerant device 1A.
In this two-stage screw bolt refrigerant device 1B, have the condenser 13 from the cold-producing medium circulation stream I and the part branch between the expansion valve 14 comes out and the middle stream IV of branch that is provided with throttling arrangement 17, the stream IV of this branch accumulates with middle oil that portion 29 is communicated with but is communicated with the gas compression stroke that is formed by the 1st grade of screw rotor 24.Like this, according to this structure, utilize this gas compression stroke cooling effect and with the above-mentioned the same oil cooler that do not need, simple structureization, miniaturization, maintenance load are alleviated, and reduced the gas compression power.
Figure 3 shows that the two-stage screw bolt refrigerant device 1C of the 1st, the 4th scheme, in this two-stage screw bolt refrigerant device 1C, for adopting same mark and omit explanation with the general part of above-mentioned two-stage screw bolt refrigerant device 1A.
In this two-stage screw bolt refrigerant device 1C, have from the condenser 13 of cold-producing medium circulation stream I and the part branch between the expansion valve 14 comes out and the middle stream IV of branch that is provided with throttling arrangement 17, the stream IV of this branch accumulates with middle oil that portion 29 is communicated with but is communicated with the gas compression stroke that is formed by the 2nd grade of screw rotor 25.Like this, according to this structure, utilize this gas compression stroke cooling effect and with the above-mentioned the same oil cooler that do not need, simple structureization, miniaturization, maintenance load are alleviated, and reduced the gas compression power.
Figure 4 shows that the two-stage screw bolt refrigerant device 1D of the 1st embodiment of the 1st, the 5th scheme, in this two-stage screw bolt refrigerant device 1D, for adopting same mark and omit explanation with the general part of above-mentioned two-stage screw bolt refrigerant device 1A.
In this two-stage screw bolt refrigerant device 1D, throttling arrangement 17 is made as expansion valve, and the discharge side of the twin-stage oil injection type helical-lobe compressor 11 on cold-producing medium circulation stream I and be positioned at the part of the primary side of condenser 13, promptly for example diagram is like that separated part between the recover 12 at twin-stage oil injection type helical-lobe compressor 11 with oil in the 1st embodiment, but is provided with the Temperature Detector 51 of detected temperatures.Like this, carry out the aperture adjusting of throttling arrangement 17 according to the temperature that Temperature Detector 51 detects, temperature reaches design temperature in the stream of this part thereby make---and 40～60 ℃ desired temperature for example is a proper temperature and can make from the temperature of the oil of the oil supply supply of oily stream II to twin-stage oil injection type helical-lobe compressor 11 in.
Figure 5 shows that the two-stage screw bolt refrigerant device 1E of the 2nd embodiment of the 1st, the 5th scheme, in this two-stage screw bolt refrigerant device 1E, for adopting same mark and omit explanation with the general part of above-mentioned two-stage screw bolt refrigerant device 1B.
In this two-stage screw bolt refrigerant device 1E, 1D is same with the two-stage screw bolt refrigerant device, throttling arrangement 17 is made as expansion valve, and the discharge side of the twin-stage oil injection type helical-lobe compressor 11 on cold-producing medium circulation stream I and be positioned at the part of the primary side of condenser 13, but promptly for example diagram in the 2nd embodiment, separate the Temperature Detector 51 that part between the recover 12 is provided with detected temperatures with oil like that at twin-stage oil injection type helical-lobe compressor 11.Like this, carry out the aperture adjusting of throttling arrangement 17 according to the temperature that Temperature Detector 51 detects, temperature reaches design temperature in the stream of this part thereby make---and 40～60 ℃ desired temperature for example is a proper temperature and can make from the temperature of the oil of the oil supply supply of oily stream II to twin-stage oil injection type helical-lobe compressor 11 in.
In addition, in the 4th, 5 schemes, control device (figure does not show) is arranged on the throttling arrangement 17.This control device calculates the aperture desired value of throttling arrangement 17 according to the temperature that detects, and makes throttling arrangement 17 actions and make actual aperture consistent with this desired value.This control device can suitably utilize prior art to constitute, and can suitably utilize the method for existing FEEDBACK CONTROL as the controlling party rule.

Claims (5)

1. two-stage screw bolt refrigerating machine comprises:
Twin-stage oil injection type helical-lobe compressor, above-mentioned twin-stage oil injection type helical-lobe compressor have the 1st grade of screw rotor and the 2nd grade of screw rotor, and described the 1st grade of screw rotor and the 2nd grade of screw rotor all have a pair of rotor of intermeshing negative and positive;
Cold-producing medium circulation stream, above-mentioned cold-producing medium circulation stream comprise that oil separates recover, condenser, expansion valve and evaporimeter;
The oil stream, above-mentioned oily stream with above-mentioned oil separate oil in the recover lead in the above-mentioned twin-stage oil injection type helical-lobe compressor, comprise oil supply place of bearing, axle envelope portion at least;
And branch's stream, above-mentioned branch stream from the above-mentioned cold-producing medium circulation stream above-mentioned condenser and the part branch between the above-mentioned expansion valve come out, and through throttling arrangement and with above-mentioned the 1st grade of screw rotor, above-mentioned the 2nd grade of screw rotor and above-mentioned the 1st grade of screw rotor and above-mentioned the 2nd grade of screw rotor between middle end difference in certain be communicated with.
2. two-stage screw bolt refrigerating machine as claimed in claim 1 is characterized in that,
Oil accumulated portion in the middle of middle end difference between above-mentioned the 1st grade of screw rotor and above-mentioned the 2nd grade of screw rotor had,
The position that above-mentioned branch stream is communicated with is that above-mentioned middle oil accumulates portion.
3. two-stage screw bolt refrigerating machine as claimed in claim 1 is characterized in that, the position that above-mentioned branch stream is communicated with is by above-mentioned the 1st grade of gas compression stroke that screw rotor forms.
4. two-stage screw bolt refrigerating machine as claimed in claim 1 is characterized in that, the position that above-mentioned branch stream is communicated with is by above-mentioned the 2nd grade of gas compression stroke that screw rotor forms.
5. two-stage screw bolt refrigerating machine as claimed in claim 1 is characterized in that also having:
Temperature Detector, said temperature detector detect in the above-mentioned cold-producing medium circulation stream, be positioned at the discharge side of above-mentioned twin-stage oil injection type helical-lobe compressor and be positioned at the stream temperature of part of the upstream side of above-mentioned condenser;
And temperature control equipment, the said temperature control device is regulated the aperture of above-mentioned throttling arrangement and is made that temperature reaches design temperature in the above-mentioned stream.
CN200510067063XA 2004-04-27 2005-04-27 Two-stage screw bolt refrigerating machine Expired - Fee Related CN1690590B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004131417 2004-04-27
JP131417/04 2004-04-27

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Publication Number Publication Date
CN1690590A CN1690590A (en) 2005-11-02
CN1690590B true CN1690590B (en) 2010-05-26

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CN (1) CN1690590B (en)

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